Bifactor vs Testlet model

[Afshin Khosravi]

Hello Phil,

Is there a difference between the bifactor IRT model and testlet response theory (TRT)? I always thought TRT is a bifactor model with a general factor and some specific factors (each testlet is considered a specific factor). However, in some papers I have seen that researchers have compared a bifactor model and a testlet model for a dataset. This implies that they are different models. Can you please explain? Thanks for your help.

Best

Afshin

 

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Afshin Khosravi, PhD TEFL, MA TEFL

[Matthias von Davier]

https://www.jstor.org/stable/20778960?seq=1

Explained the relationship between models

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